Improvement in dovetailing-machines



i .2 Sheets--She'et 1". I C. S GRIFFIN 8L J. W. WI'LKINS.

Improvement in DovetaIIin-g-Machines.

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Patented June 20,1871.

UNITED STATES PATENT OFFICE.

CRAWFORD STAPLES GRIFFIN AND J OSIAH WELLS WILKIN S, OF C'ELSEA,

, MARTE.

IMPROVEMENT IN DOVETAILING-MACHINES.

Specication forming part of Letters Patent No. 116,178, dated June 20,1871.

` To all whom it may concern:

Be it known that we, CRAWFORD `STAPLES GRIFFIN and JosIAH WELLS WILKINs,of Chelsea, in the county of Waldo and State of Maine, have invented anew and valuable Improvement in Dovetailing-Machines; and we do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawing making a part of this specification and to the lettersof reference marked thereon.

Figurel of the drawing is a front view oi' our invention. Fig. 2 is avertical section of the same. Fig. 3 is a horizontal section thereof.Fig. 4 is a face view of detached turning plate. Fig. 5 is a face viewof detached back plate. Fig. 6 is a face view of detached top plate.Fig. 7 is a sectional view of devices for attaching the saw.

This invention has relation to certain improvements indovetailing-machines, designed for use in connection withtenoning-machines. The object in View is to renderrthe adjustment of themachine more perfect, and otherwise adapt it more fully to its properpurpose.

The invention in question may be considered as an improvement on thedovetailingmachine for which Letters Patent bearing date November 8,1870, were granted to us.

1n the accompanying drawing illustrating this invention, A representsthe main plate, on which the turning plate B turns as on a pivot, thelatter being provided with curved guiding-ilanges b, fitting to thecurved ends of the main plate. C is a dovetailed plate, fitting. in adovetailed recess inthe face of the plate B, where it is secured byscrews b passing through slots b, formed in plate G, into plate B. Tothe plate G are attached the standards D, supporting, in boxes d, thesaw-shaft d', on the lower end of which is the saw E, and between theboxes d the belt-pulley E', all as represented clearly. in Figs. l and 2of the drawing. By means of the plate G the saw may be adjustedlaterally. F denotes a vertical standard or plate, with dovetailededges, and F F a pair of horizontal parallel arms, with lugs G G',dovetailed on their inner sides to correspond with the edges of theplate F, upon which they fit, and serving as a means of verticaladjustment to the plate A and attachments. These arms are connectedtogether by vertical pieces, and are beveled on their upper and loweredges, respectively, so as to lit in a dovetailed chamber formed in theback plate A, and allow the latter, to have a lateral adjustmentthereon. To secure said plate in any proper position screws GJ areprovided; they pass through slots g and into the plate B. H indicates anadjusting screw-shaft, having its fixed bearing in a bracket, h.,projecting from the plate A, and its movable bearing in theconnecting-piece h of the horizontal arms F, so that when turnedhorizontal lateral motion will be given to the plate A. I` indicates avertical adjusting screw-shaft,which lpasses through a bracket, i, ontop of the plate F, and also through one or both the lugs G', in whichit should have its screw or movable bearing, so that, when turned, itwill operate to raise 0r lower the horizontal arms F and theirconnections. J represents an elbow-lever, pivoted to thelaterally-projecting wing J of the plate A, and connected to thetripgear of a tenoning-machine. Through the medium of this lever, whenits outer end is drawn down, the turning plate B is thrown up into avertical position, so as to cause the saw to make the iirst or straightcut of the dovetail. The lever is then released and the turn plateallowed or caused to fall back, in order to give the proper angle to thesaw for making the beveled cut of the dovetail.

For the purpose of cutting a parallel-sided kerf the saw must be kepthorizontal, and vertical and horizontal adjustment only resorted to.With this object in view, a button, k, is inserted in the outer edge ofthe plate B, so',` that when turned with the head downward it?` willoverlap the outer edge of the plate A, and in this way prevent theturning back of the plate B. A like provision is made to keep the plateB from moving outward past the edge of the plate A, the buttons k beingattached to the latter andY arranged to overlap the former plate.

Referring to the saw E, it will be seen that there are secured to thearbor d a nut, e, above, and one,- e', below said saw, so that it may bemore readily adjusted, and that a washer or nut, e, is arranged betweenthe saw and the arbor for the purpose of preventing the wear of thelatter.

3. The combination of the screw-shafts Hv and I, arms F', standard F,andplates A and B, constructed substantially as and for the purposesspecified.

In testimony that We claim the above We have hereunto subscribed ournames in the presence of two Witnesses.

CRAWFORD STAPLES GRIFFIN. JOSIAH WELLS WILKIN S.

Witnesses:

CHARLES A. GILMAN, LEMUEL S. HASETING.

